40232 2010-06-07 06:10:22 -0700 postMessage(window) throws "Type error" with input elements other than text fields 2010-06-08 13:35:32 -0700 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) PC All RESOLVED DUPLICATE 40329 P2 Normal --- 39757 0 kim.1.gronholm webkit-unassigned hausmann oliver oldest_to_newest 234815 0 58021 kim.1.gronholm 2010-06-07 06:10:22 -0700 Created attachment 58021 Backtrace of postMessage(window) throwing a type error postMessage(window) should throw TypeError: "Cannot post cyclic structures." like it (normally) does in LayoutTests/fast/dom/Window/window-postmessage-clone.html. However, in case the TreeWalker traverses through an input element other than text field before it notices the cyclic structure, it throws TypeError: "Type error". This issue was revealed when adding a new attribute to Element.idl which caused the hash lookup to traverse through the objects/properties in different order in LayoutTests/fast/dom/Window/window-postmessage-clone.html. The issue can also be seen by slightly modifying the test page by e.g. adding a dummy input element on top of the test page with type "button" or "file" (I'll attach a test case for this) The reason why this happens is that when the TreeWalkers in WebCore/bindings/ js/SerializedScriptValue.cpp walk through the objects and their properties, the getProperty function ends up querying the JSHTMLInputElement::selectionStart or JSHTMLInputElement::selectionEnd properties whose getters throw the type error in case the input element is not of type "TextField" (!input->canHaveSelection()) See the example backtrace for further clarification. 234818 1 58022 kim.1.gronholm 2010-06-07 06:17:11 -0700 Created attachment 58022 LayoutTests/fast/dom/Window/window-postmessage-clone with additional input element Added a test case that is otherwise identical to LayoutTests/fast/dom/Window/window-postmessage-clone.html except one dummy input (type="button") element that is added on top of the page. This dummy input element makes the postMessage(window) test fail prompting: PASS: 'postMessage(window)' threw TypeError: Type error when the expected output would be: PASS: 'postMessage(window)' threw TypeError: Cannot post cyclic structures. Removing the dummy button results in the expected output. 235486 2 kim.1.gronholm 2010-06-08 13:35:32 -0700 The actual issue is that postMessage should serialise dom objects to null by default and it is being tracked in https://bugs.webkit.org/show_bug.cgi?id=40329 *** This bug has been marked as a duplicate of bug 40329 *** 58021 2010-06-07 06:10:22 -0700 2010-06-07 08:01:04 -0700 Backtrace of postMessage(window) throwing a type error postmessage-backtrace text/plain 1674 kim.1.gronholm IzAgIEpTQzo6RXJyb3I6OmNyZWF0ZSAoZXhlYz0weGIwOWEwMTAwLCB0eXBlPUpTQzo6VHlwZUVy cm9yLCBtZXNzYWdlPS4uLiwgbGluZU51bWJlcj0tMSwgCiAgICBzb3VyY2VJRD0tMSwgc291cmNl VVJMPS4uLikgYXQgLi4vLi4vLi4vSmF2YVNjcmlwdENvcmUvcnVudGltZS9FcnJvci5jcHA6NjQK IzEgIDB4YjcyNWE0ZGIgaW4gSlNDOjp0aHJvd0Vycm9yIChleGVjPTB4YjA5YTAxMDAsIHR5cGU9 SlNDOjpUeXBlRXJyb3IpCiAgICBhdCAuLi8uLi8uLi9KYXZhU2NyaXB0Q29yZS9ydW50aW1lL0Vy cm9yLmNwcDoxMDgKIzIgIDB4YjY3ZmZlZjUgaW4gV2ViQ29yZTo6SlNIVE1MSW5wdXRFbGVtZW50 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